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NS_E_WMX_INVALID_FORMAT_OVER_NESTING
Understanding NS_E_WMX_INVALID_FORMAT_OVER_NESTING in a Windows Media playlist
NS_E_WMX_INVALID_FORMAT_OVER_NESTING (0xC00D1076) is returned when playlist expansion exceeded the supported depth for nested playlist references.
Distinguish in-memory Playlist state, WPL or ASX parsing, nested-list expansion, Media-object resolution and execution of referenced items. The relevant condition is playlist expansion exceeded the supported depth for nested playlist references.
Minimal playlist experiment
- Capture the resource identity and the include graph, canonicalized URLs, repeated files, maximum observed depth and any cycle.
- Verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object instance.
- Run the narrow experiment: flatten one level at a time until the same media items load without recursively opening another playlist.
- Do not combine this focused test with a codec-pack change, Player reset, or broad registry cleanup.
- If a new specific HRESULT appears afterward, this condition was cleared; diagnose the new result separately.
What the result means
| Retest outcome | Interpretation |
|---|---|
| A later HRESULT appears | The rejected condition — playlist expansion exceeded the supported depth for nested playlist references — was cleared; diagnose the new code at its own layer. |
Actions that obscure the cause
- raising a generic XML recursion limit in application code.
Technical references
- Windows Media Player SDK
- Windows Media Playlists
- Windows Media Playlist elements
- Managing playlists
- Microsoft HRESULT registry
The fix is demonstrated by the same Player path succeeding with the same resource, not by another application opening it.
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